Buddy bike / Buddy bike

This bicycle is designed for a child. The bike is a buddy to a child and accompany them as they grow up. It can also contributes to the protection of the environment, by avoiding extra waste from discarded bicycles. Using a combination structure to connect the handlebar, seat, and pedal, the bike can fit the varying height of each person. It uses a simple transformative function to adjust its height and overall size. Using a sliding interlocking system, the handlebar and seat can be adapted to the user's height quickly and easily.